1. Enzyme competition occurs when:
A. one type of enzyme reacts with one type of substrate.
B. an enzyme does not react with a substrate.
C. three different types of enzymes react with one type of substrate.
D. an enzyme stops a reaction.

is it C

2. The proton pump is responsible for the production of:
A. ATPs.
B. oxygen.
C. ADP.
D. All of these answers are true.